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Date:	Mon, 28 Jul 2014 13:55:04 +0100
From:	David Vrabel <>
To:	Frediano Ziglio <>,
	Konrad Rzeszutek Wilk <>,
	Boris Ostrovsky <>
CC:	xen-devel <>,
	linux-kernel <>
Subject: Re: xen: Fix possible page fault in fifo events

On 15/07/14 14:48, Frediano Ziglio wrote:
> sync_test_bit function require a long* read access to pointer.
> This is a problem if the you are using last entry in the page causing
> an access to next page. If this page is not readable you get a memory
> access failure (page fault).
> All other x64 bit functions access memory using 32 bit operations.
> For processors different than x64 long aligned operations are used.

I think we should implement a set of 32-bit bit ops.  We fudged around
it for the arm64 problem but this second problem shows we need a better


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